Drive - Canon EOS 40D Service Manual

２）Flash settings with the menu
The built-in flash and external Speedlite settings can be set with the menu screen (Fig.
017 to 019). [Built-in flash func. setting] is a group with [Flash exp. comp], [Shutter sync],
and [E-TTL II] (Evaluative/Averaged metering). The latter two were previously Custom
Functions.
[External flash func. setting] now includes [Wireless set.] from the EOS-1D Mark III's [Flash
function settings]. This is to enable wireless, multi-Speedlite control.
Fig. 017 Flash control
1.8 Drive
１）6.5 fps high-speed continuous shooting
Maximum continuous shooting speed of approx. 6.5 fps (in both One-Shot AF and
AI SERVO AF modes) and a stable viewfinder image are attained by the following
technologies:
・ T wo-motor system. One motor
dedicated to driving the mirror,
and one motor dedicated to
cocking the shutter in high-
speed (Fig. 020).
・ A stopper is incorporated to
prevent the bounding of the
main mirror and secondary
mirror (Fig. 020). This results
in shorter viewfinder blackout
and a stable viewfinder image
during continuous shooting.
・ A 10.10-megapixel CMOS
sensor executing 4-channel,
high-speed reading.
・ D IGIC III for high-speed image processing.
・ T he buffer memory is a DDR SDRAM for high-speed reading and writing. (EOS 30D had
SDRAM.)
２）Maximum burst during continuous shooting
With DIGIC III and DDR SDRAM and a circuit design to take advantage of their maximum
performance, the maximum burst at approx. 6.5 fps is approx. 75 shots in JPEG Large/Fine
and approx. 17 shots in RAW.
＊ B ased on Canon's testing standards with a 1GB CF card. The maximum burst during continuous shooting varies
depending on the shooting conditions (subject, CF card brand, ISO speed, Picture Style, etc.).
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Fig. 018 Built-in flash control
Shutter-cocking system
Shutter-cocking
motor
Secondary mirror-bounding
prevention mechanism
10
Technical Information
Fig. 019 Wireless flash control
Mirror-driving system
Main mirror
Secondary mirror
Main mirror-bounding
prevention mechanism
Fig. 020 Two-motor system
Main mirror-driving
motor